Check the listing for details. GELISH Harmony Dynamic DUO GEL SET Polish Foundation Base Top Coat AUTHENTIC. Color: Clear, Condition: New without box. Listed at 25.99 USD. This Dynamic Duo package includes bottles of Gelish Top It Off and Gelish Foundation Gel. The Foundation is a soak off base gel that creates an adhesive bond between the nail plate and gel products that will not damage the nail plate. It serves as a base for Gelish Soak-Off Gel Polish or Gelish Structure Gel. The Top It Off Sealer Gel is a soak off product that seals your Gelish Soak-Off Gel Polish with a high shine finishIt wont chip, peel or become dull. Gelish products apply like nail polish and cure in 30 seconds with an LED light or two minutes with a UV Light. The polish stays on nails for up to 21 days, and it soaks off in just 10 - 15 minutes with Gelish Soak-Off Remover. Gelish originated and patented brush-in-bottle gel-polish. These professionals know how important nail craft products are, and the company is committed to consistency with everything it manufactures. Quality and consistency are top priorities for Gelish.